Tips and Tricks in a world of Mix

Suppose you want to instantiate a new generic object inside a generic class. The problem is the C# compiler does not know whether the type argument the client will use has a matching constructor, and it will refuse to compile the instantiation line.

To address this problem, C# allows you to constrain a generic type parameter such that it must support a public default constructor. This is done using the new() constraint. For example, here is a different way of implementing the default constructor of the generic Node from Code block 3.